Brainscape's Knowledge GenomeTM

Browse over 1 million classes created by top students, professors, publishers, and experts.


See full index

Chemistry > Chemical Analysis - Paper 2 > Flashcards

Chemical Analysis - Paper 2 Flashcards

You may prefer our related Brainscape-certified flashcards:
Periodic Table flashcards Chemistry 101 flashcards AP® Chemistry flashcards Organic Chemistry 101 flashcards
1
Q

What is a pure substance?

A

A single element or compound, not mixed with any other substance

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

What is a characteristic of pure substances?

A

They melt and boil at specific temperatures.

So, this melting and boiling points data can be used to distinguish pure
substances from mixtures

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

What is a formulation?

A

Mixture that has been designed as a useful product

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

How are formulations made?

A

By mixing the components in carefully measure quantities to ensure that the products has the required properties.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

Give 3 examples of formulations?

A

Fuel
Paint
Medicine

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

What is the technique of chromatography used for?

A

Used to separate mixtures and give information to help identify substances

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

What does chromatography involce?

A

A stationary phase
A mobile phase

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

What is the Rf value?

A

(The distance moved by substance) / ( Distance moved by solvent)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

What occurs the more soluble a substance is?

A

The more soluble a substance is, the further up the chromatography paper it travels.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

What does chromatography do?

A

Separate different pigments in a coloured substance

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q

What is the test for hydrogen?

A

Squeaky pop test

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
12
Q

Describe the squeaky pop test

A

Use a burning splint held at the open end of a test tube of the gas.

It will create a squeaky pop sound and the hydrogen burns rapidly

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
13
Q

What is the test for oxygen?

A

Re-lighting splint

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
14
Q

Describe the test for oxygen?

A

Use a glowing splint and insert into a test tube of the gas.

The splint relights in the oxygen.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
15
Q

What is the test for carbon dioxide?

A

Lime water turns cloudy test

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
16
Q

Describe the test for carbon dioxide

A

Bubble the CO2 gas into the limewater, and it will turn cloudy

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
17
Q

What is the test for chlorine?

A

Litmus paper test

18
Q

Describe the test for chlorine

A

Use a damp litmus paper, and when it is put into chlorine gas, the litmus paper is bleached and will turn white.

19
Q

What is the flame test for lithium

A

Crimson

20
Q

What is the flame test for sodium?

A

Yellow

21
Q

What is the flame test for potassium?

A

Lilac

22
Q

What is the flame test for calcium?

A

Orange red

23
Q

What is the test for copper?

A

Green

24
Q

What do aluminium, calcium and magnesium ions produce with NaOH?

A

A white precipitate

25
Q

With what elements does NaOH produce a white precipitate with?

A

Aluminium
Magnesum
Calcium

26
Q

What happens when excess NaOH is added?

A

Aluminium precipitate dissolves.

27
Q

What does copper (II) and NaOH produce?

A

Blue precipitate

28
Q

What does Iron (II) and NaOH produce?

A

Green precipitate

29
Q

What does iron (III) and NaOH produce?

A

Brown precipitate

30
Q

What does carbonate and dilute acid produce?

A

CO2

31
Q

Chlorine + dilute nitric acid + silver nitrate =

A

White precipitate

32
Q

Bromine+ dilute nitric acid + silver nitrate =

A

Cream precipitate

33
Q

Iodine + dilute nitric acid + silver nitrate =

A

Yellow precipitate

34
Q

Sulfate + hydrochloric acid + barium chloride =

A

white precipitate

35
Q

How can elements and compounds be detected?

A

Using instrumental methods

36
Q

Advantages of instrumental methods?

A

Accurate
Sensitive
Rapid

37
Q

Example of instrumental test?

A

Flame emission spectroscopy

38
Q

What is the flame emission spectroscopy used for?

A

To analyse metal ions in solutions

39
Q

How does the flame emission spectroscopy work?

A
  1. Sample is put into a flame and the light given out is passed through a spectroscope.
  2. The output is a line spectrum, that can be analysed to identify the metal ions in the solution and measure their concentrations.
40
Q
A

Chemistry (3 decks)

Brainscape helps you reach your goals faster, through stronger study habits.
© 2024 Bold Learning Solutions. Terms and Conditions